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Display name of a rule as it will appear in a syntax error message &quot;expected &lt;rule name&gt;&quot;.
For an empty string short error message will not be generated. Value is a text or a rule reference.

<h2>Examples:</h2>
<pre><code>
  operator ::= '+' | '-' | '*' | '/' | "="   {name="operator"}
</code></pre>

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